Network Connection Class

Network Connection Class is an Android library that allows you to figure out
the quality of the current user’s internet connection. The connection gets
classified into several “Connection Classes” that make it easy to develop
against. The library does this by listening to the existing internet traffic
done by your app and notifying you when the user’s connection quality changes.
Developers can then use this Connection Class information and adjust the application’s
behaviour (request lower quality images or video, throttle type-ahead, etc).

Network Connection Class currently only measures the user’s downstream bandwidth.
Latency is also an important factor, but in our tests, we’ve found that bandwidth
is a good proxy for both.

The Network Connection Class library takes care of spikes using a moving average
of the incoming samples, and also applies some hysteresis (both with a minimum
number of samples and amount the average has to cross a boundary before triggering
a bucket change):

Integration

Download

Download the latest JARs or grab via Gradle:

compile 'com.facebook.network.connectionclass:connectionclass:1.0.1'

or Maven:

<dependency>
  <groupId>com.facebook.network.connectionclass</groupId>
  <artifactId>connectionclass</artifactId>
  <version>1.0.1</version>
</dependency>

Calculate Connection Class

Connection Class provides an interface for classes to add themselves as
listeners for when the network’s connection quality changes. In the subscriber
class, implement ConnectionClassStateChangeListener:

public interface ConnectionClassStateChangeListener {
  public void onBandwidthStateChange(ConnectionQuality bandwidthState);
}

and subscribe with the listener:

ConnectionClassManager.getInstance().register(mListener);

Alternatively, you can manually query for the current connection quality bucket with
getCurrentBandwidthQuality().

ConnectionQuality cq = ConnectionClassManager.getInstance().getCurrentBandwidthQuality();

The main way to provide the ConnectionClassManager data is to use the DeviceBandwidthSampler.
The DeviceBandwidthSampler samples the device’s underlying network stats when you tell it
you’re performing some sort of network activity (downloading photos, playing a video, etc).

// Override ConnectionClassStateChangeListener
ConnectionClassManager.getInstance().register(mListener);
DeviceBandwidthSampler.getInstance().startSampling();
// Do some downloading tasks
DeviceBandwidthSampler.getInstance().stopSampling();

If the application is aware of the bandwidth downloaded in a certain time frame,
data can be added to the moving average using:

ConnectionClassManager.addBandwidth(bandwidth, time);

See the connectionclass-sample project for more details.

Improve Connection Class!

See the CONTRIBUTING.md file for how to help out.

License

Connection Class is BSD-licensed. We also provide an additional patent grant.